stevens



(No Model.) I 3 Sheets-Sheet 1.

F. M. STEVENS.

DEVICE FOR CONVERTING MOTION.

NO. 285,083. Patented Sept. 18, 1883.

' INVENTOR: $624M By his JHO'IILGl/S,

n ruins PMoUihogr-aphan wmmm n. a

(No Model. 3 Sheets-Sheet 2.

F. M. STEVENS.

DEVICE FOR CONVERTING MOTION.

Patented Sept. 18, 1883.

' TOR:

By 71 is tiltoi-lteys,

WMM'

he m. wmill am n. c.

(No Model.) 3 Sheets-Sheet 3. y 1-". M. STEVENS. I DEVICE FOR CONVERTING MOTION.

No. 285,083. Patented Sept. 18, 1883.

INVENTOR'. W' ZM WW2 By his Jittorneys,

nnnnnnnnnnnnnnnn n nnnnnnnnnn nnnnn c.

" U ITED STATES PATENT OFF CE.

FRANK M. STEVENS, OF YORK, N. Y., ASSIGNOR TO THE STEVENS LOCOMOTIVE AND MACHINE COMPANY, OF SAME PLACE.

DEVICE FOR CONVERTING MOTION.

SPECIFICATION forming part of Letters Patent No. -285,083, dated September 18, 1883.

- Application filed July 7,1883. (N0 model.) l I To all whom it may concern Be it known that I, FRANKM. STEVENS, of the city, county, and State of New York, acitizen of the United States, have invented certain improvements in mechanical movements, adapted particularly but not necessarily for operating the valve-gear of steam-engines, of which the following is a specification.

My invention relates to a novel device for converting reciprocating into rotary motion. It may be applied to any mechanism where this conversion is desirable; but I have shown it in the accompanying drawings as applied to the rotation of the cam-shaft of a locomotive valve-gear. For this purpose I find it well adapted, as it reduces the weight of the parts as compared with the mechanisms usually employed for the conversion of the motion, and materially simplifies the construction.

In the drawings which serve to illustrate my invention, Figures 1 and 2 are side elevations, showing the operative parts in different positions. Fig. 3 is a front elevation of the mechanism, the cross-head guides being in section. Fig. 4 is a side elevation illustrating a modification, and Figs. 5 and 6 illustrate a11- other modification.

Let A represent a locomotive-engine cylinder; B, the cross-head guides; O, the crosshead arranged to reciprocate in said guides, and D the connecting-rod which couples the cross-head to the wrist-pin in the driver. These may be of the usual kind.

E is the shaft, upon which are mounted the cams which impart the necessary motion to the slide-valve of the engine. I have not consideredit necessary to show these cams, as they are well known; The shaft E is mounted rotatively in bearings a, which may be secured to the cross-head guides, and on the end of shaft E is secured a crank, F-

I will now describe the mechanism whereby alternate reciprocation of the cross-head imparts continuous rotary motion to crank F.

G is what I call a reducingrlever, the upper end of which is coupled to the wrist-pin b of crank F. e

H, I call a lever-rod, one end of whichis coupled to the lpwer end of lever G, and the other to a prolongation, '0, of the cross-head.

I is what I call a fulcrum-bar, one end of which is coupled to the reducing-lever between its ends, and the other to some fixed part at las a provision on the cross-h ead guides, for example. When the shaft E is not otherwise provided with weighty attachments sufficient to store up power enough to carry it over centers, it should be furnished with a flywheel.

In the application of my device to a locomotive, however, the shaft E willhave two cranks F, set at right angles, and there will be two sets of mechanism for converting the motion one for each engine, as shown in Fig. 3. Thus both of the locomotiveengines will act on shaft E simultaneously and at right angles, and there will be no danger of its stopping on centers. Any tendency to this would, however,

of'bar I; and inthe slot 6, I arrange a guidingstud, f, set directly under the axis of the shaft E. As the lever G plays longitudinally, the stud plays along the slot, as will be well understood, and serves as a shifting-fulcrum.

The operation of the device is too simple to require more than a brief description.

Fig. 1 shows the cross-head at the end of its 'outstroke, and crank F atthe end of its i11- stroke, or on its inside center. As the crosshead moves in, (see arrow in Fig. 2,) lever-rod H carries back the lower end of the lever G, and by reason of the attachment of bar I to the lever the upper end of the latter turns crank F over outward. The swing of bar I and rod H permits the upperend of lever Gto follow the circle traversed by pin Z2 in the crank. The bar I and rod H are shown as arranged both on one side of shaft E but this is not absolutely necessary.

In Figs. 5 and 6, I haveishown another modification of my device, in which the reducinglever G is fulcrumed at d, and the end of I is coupled to its upper end instead of at d. Fig.

5 shows the crank E standing at right angles to its position in Fig. 6.

I have said that my invention is a device for converting reciprocating into rotary motion; but it is also adapted for converting rotary into reciprocating motion-as, for example, rotation of the shaft E will produce alternate reciprocation of the cross-head.

Having thus described my invention, I wish i 2. A mechanism or device for converting motion, comprising a shaft mounted to rotate and provided with a crank, a reciprocating part, a reducing-lever coupled at one end directly to the crank, and at its other end to the end of a lever-rod, the said lever-rod coupled to the reciprocating part, and a fulcrum-bar connected at one end to the reducing-lever, and the other to some fixed part or the specified equivalent of sa-i d fulcrum-bar, all arranged to operate substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

FRANK M. STEVENS.

WVitnesses:

JOHN C. BULLARD, Vi E. LLOYD. 

